What's the difference between the norwalk virus and the stomach flu?

Sometimes None: Norwalk virus causes symtoms that most would classify as "stomach flu". They can include nausea, vomiting, diarrhea, abdominal pain, muscle aches, headache, tiredness and low-grade fever. Lasts 24- 48 hrs (longer in kids) usually resolving on its own. There are no known long- term effects after recovery from this infection. Importance is to stay well-hydrated and treat symptoms.

Norwalk Virus: Norwalk Virus is one possible cause of stomach flu. Norwalk virus causes viral gastroenteritis often within 24 to 48 hours of exposure. Most often the symptoms last from 12 to 48 hours. Sx's may include nausea, vomiting, diarrhea, abdominal cramps, headache, muscle pain, low-grade fever & malaise. Norwalk virus occurs more often in adults & older children as compared to infants / toddlers.